Test Conducted by the Instituut Collectie Nederland, Amsterdam
Residue and age-resistance when cleaning paper – Testing akapad white hard (formerly wishab)
In October 2001, the independent Instituut Collectie Nederland in Amsterdam tested the product akapad white hard, which at the time of testing was still sold under the product name "wishab Spezialschwamm." They tested for residue and age-resistance when cleaning paper.
"On paper that was treated with the sponge and subsequently shaken and brushed off, no residue remained. Thus no negative reaction with the paper can take place."
We will gladly provide you with the complete test report "Research into the effects of wishab Spezialschwamm on paper" as a PDF file upon request.